:root {
  --primary: #2c3e50;
  --accent: #e74c3c;
  --bg: #f8f9fa;
  --text: #2c3e50;
  --card-bg: #ffffff;
  --shadow: rgba(0,0,0,0.1);
  --transition: 0.3s ease;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont,
               "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  background: var(--primary);
  color: #fff;
  padding: 1rem;
  text-align: center;
}

.search-section {
  padding: 0.5rem 1rem;
}

#searchInput {
  width: 100%;
  padding: 0.75rem;
  font-size: 1rem;
  border: 1px solid var(--shadow);
  border-radius: 8px;
}

.drug-list {
  flex: 1;
  padding: 1rem;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px,1fr));
  gap: 1rem;
}

.drug-card {
  background: var(--card-bg);
  border-radius: 12px;
  box-shadow: 0 2px 5px var(--shadow);
  padding: 1rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform var(--transition);
}

.drug-card:hover {
  transform: translateY(-5px);
}

.drug-name {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.details-btn {
  margin-top: auto;
  padding: 0.75rem;
  font-size: 1rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: filter var(--transition);
}

.details-btn:hover {
  filter: brightness(0.9);
}

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition), visibility var(--transition);
}

.modal.show {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  background: #fff;
  border-radius: 12px;
  padding: 1.5rem;
  max-width: 400px;
  width: 100%;
  position: relative;
  box-shadow: 0 4px 10px var(--shadow);
}

.close-btn {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  background: transparent;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
}

.hidden { display: none; }